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nusb/kb: only send to mousein when mouse state actually changes

--- a/sys/src/cmd/nusb/kb/kb.c

+++ b/sys/src/cmd/nusb/kb/kb.c

@@ -460,6 +460,7 @@

 	char	err[ERRMAX];

 	char	mbuf[80];

 	int	c, b, nerrs;

+	int	lastx, lasty, lastb;

 	KDev*	f = a;

 	Ptr	p;

@@ -467,6 +468,7 @@

 	sethipri();

 	memset(&p, 0, sizeof(p));

+	lastx = lasty = lastb = 0;

 	nerrs = 0;

 	for(;;){

@@ -508,7 +510,14 @@

 		if(p.z != 0)

 			b |= (p.z > 0) ? 8 : 16;

-		seprint(mbuf, mbuf+sizeof(mbuf), "m%11d %11d %11d", p.x, p.y, b);

+		if(lastx == p.x && lasty == p.y && lastb == b)

+			continue;

+

+		lastx = p.x;

+		lasty = p.y;

+		lastb = b;

+

+		seprint(mbuf, mbuf+sizeof(mbuf), "m%11d %11d %11d", lastx, lasty, lastb);

 		if(write(f->infd, mbuf, strlen(mbuf)) < 0)

 			kbfatal(f, "mousein i/o");

 	}

-- 

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